AM_Pargasite_54
Formula: Na.45 K.1 Mg2.97 Fe1.57 Al.97 Ti.21 Ni.01 Zn.01 Ca1.84 Mn.02 Si7.4 H1.972 O23.972 F.028
Name: Pargasite
Unit cell: 9.867 18.044 5.318 90.0 105.06 90.0 , V=914.30
Space group: C12/M1 (12)

Oberti R , Ungaretti L , Cannillo E , Hawthorne F C , Memmi I , European Journal of Mineralogy , 7 (1995) p.1049-1063, Temperature-dependent Al order-disorder in the, tetrahedral double chain of C2/m amphiboles, Sample: S(6), Note: O(5) y-coordinate changed to reproduce reported bond lengths